Nano calcium carbonate preparation device

Abstract

The utility model relates to a technical field of chemical industry machinery, especially to a kind of nano calcium carbonate preparation device.Nano calcium carbonate preparation device includes: carbon dioxide conveying component, spray reaction tank and separation component, carbon dioxide conveying component and separation component are connected with spray reaction tank;Carbon dioxide conveying component includes first air compressor and pressure stabilizing tank, the air pipe of first air compressor is connected with pressure stabilizing tank, the air pipe of pressure stabilizing tank is connected with spray reaction tank;The top of spray reaction tank is provided with the spray head for spraying calcium hydroxide solution, and spray reaction tank is provided with pressure reducing valve;Separation component includes the suction filtration mechanism for separating the nano calcium carbonate generated by reaction with calcium hydroxide solution.The nano calcium carbonate preparation device provided by the utility model improves the particle distribution uniformity of the product prepared, the overall land area is small, the energy consumption is smaller, and the preparation cost is low.

Description

Technical Field

[0001] This utility model relates to the field of chemical machinery technology, and in particular to a device for preparing nano-calcium carbonate. Background Technology

[0002] Nano-calcium carbonate refers to calcium carbonate products with a particle size ranging from 0-100 nm, including both ultrafine and ultramicrofine calcium carbonate. Nano-calcium carbonate possesses advantages such as fine particle size, large specific surface area, high surface activation rate, and high whiteness, making it one of the nanomaterials currently capable of large-scale industrial production and application. Due to its low cost and excellent performance, nano-calcium carbonate is widely used in industries such as rubber, plastics, and papermaking, and can also serve as a substitute for expensive powder materials such as silica and titanium dioxide.

[0003] Currently, carbonation is the mainstream process for producing nano-calcium carbonate. Carbonation is further divided into three main process routes: intermittent bubbling carbonation, multi-stage spray carbonation, and centrifugal method. However, these three methods still have drawbacks. Intermittent bubbling carbonation produces products with uneven particle distribution; while multi-stage spray carbonation and centrifugal method produce more uniform products compared to intermittent bubbling carbonation, they require larger equipment footprints and consume more energy. Utility Model Content

[0004] The purpose of this invention is to provide a nano-calcium carbonate preparation device to alleviate the problems of uneven particle distribution, large equipment footprint, and high energy consumption in products produced by existing nano-calcium carbonate production methods.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A nano-calcium carbonate preparation apparatus includes: a carbon dioxide delivery component, a spray reaction tank, and a separation component, wherein the carbon dioxide delivery component and the separation component are both connected to the spray reaction tank;

[0007] The carbon dioxide delivery assembly includes a first air compressor and a pressure stabilizing tank. The outlet pipe of the first air compressor is connected to the pressure stabilizing tank, and the outlet pipe of the pressure stabilizing tank is connected to the spray reaction tank.

[0008] The top of the spray reaction tank is equipped with a spray head for spraying calcium hydroxide solution, and the spray reaction tank is equipped with a pressure reducing valve;

[0009] The separation assembly includes a filtration mechanism for solid-liquid separation of the nano-calcium carbonate and calcium hydroxide solution generated in the reaction.

[0010] Furthermore, the carbon dioxide delivery assembly also includes a pressure swing adsorber (PSA), the outlet pipe of which is connected to the first air compressor, and the PSA is used to concentrate carbon dioxide gas.

[0011] Furthermore, the carbon dioxide delivery assembly also includes a water washing bottle, the outlet pipe of which is connected to the pressure swing adsorber.

[0012] Furthermore, the carbon dioxide delivery assembly also includes a second air compressor and a gas collection tank. The second air compressor is connected to the gas collection tank, and the exhaust gas is collected into the gas collection tank through the second air compressor. The outlet pipe of the gas collection tank is connected to the washing bottle.

[0013] Furthermore, the bottom of the spray reaction tank is connected to an air inlet pipe, and the air outlet pipe of the pressure stabilizing tank is connected to the air inlet pipe. The air inlet pipe has multiple air holes along its axial and radial directions.

[0014] Furthermore, the spray head is connected to a liquid inlet pipe, and the other end of the liquid inlet pipe is connected to a calcium hydroxide solution delivery assembly.

[0015] Furthermore, the calcium hydroxide solution delivery assembly includes a solution tank, an aging tank, and a delivery pump. The aging tank and the filtration mechanism are both connected to the solution tank via pipelines. The calcium hydroxide solution in the solution tank is delivered to the inlet pipeline by the delivery pump.

[0016] Furthermore, the aging tank is equipped with a stirring mechanism, which is used to stir and dissolve calcium hydroxide to form a saturated solution.

[0017] Furthermore, the bottom of the spray reaction tank is provided with a discharge pipe, and the separation assembly also includes a storage tank. The discharge pipe is connected to the top of the storage tank, and the bottom of the storage tank is connected to the filtration mechanism through a pipeline.

[0018] Furthermore, the spray reaction tank is equipped with an exhaust gas discharge structure.

[0019] This utility model brings at least the following beneficial effects:

[0020] This invention provides a nano-calcium carbonate preparation device, comprising: a carbon dioxide delivery component, a spray reaction tank, and a separation component. Both the carbon dioxide delivery component and the separation component are connected to the spray reaction tank. The carbon dioxide delivery component includes a first air compressor and a pressure stabilizing tank. The outlet pipe of the first air compressor is connected to the pressure stabilizing tank, and the outlet pipe of the pressure stabilizing tank is connected to the spray reaction tank. The top of the spray reaction tank is equipped with a spray head for spraying calcium hydroxide solution, and the spray reaction tank is equipped with a pressure reducing valve. The separation component includes a filtration mechanism for solid-liquid separation of the reacted nano-calcium carbonate and the calcium hydroxide solution.

[0021] Carbon dioxide gas is compressed by a first air compressor, and its pressure is controlled by a pressure stabilizing tank. A pressure reducing valve also controls the pressure within the spray reaction tank. The spray nozzle propels calcium hydroxide solution into the spray reaction tank, effectively increasing the contact area between the carbon dioxide gas and the calcium hydroxide solution. The resulting nano-calcium carbonate and calcium hydroxide solution are then separated by a filtration mechanism, and the final product is dried to obtain nano-calcium carbonate.

[0022] The nano-calcium carbonate preparation device improves the particle distribution uniformity of the product by controlling the carbon dioxide gas pressure and increasing the contact area between carbon dioxide gas and calcium hydroxide solution. Moreover, it has a small overall footprint, low energy consumption, and low preparation cost.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall apparatus for preparing nano-calcium carbonate provided in an embodiment of the present invention.

[0026] icon:

[0027] 100-Carbon dioxide delivery assembly; 110-First air compressor; 120-Pressure stabilizing tank; 130-Pressure swing adsorber; 140-Washing bottle; 150-Second air compressor; 160-Gas collection tank;

[0028] 200 - Spray reaction tank; 210 - Spray head; 220 - Pressure reducing valve; 230 - Liquid inlet pipe;

[0029] 300 - Separation component; 310 - Filtration mechanism; 320 - Storage tank;

[0030] 400 - Calcium hydroxide solution conveying assembly; 410 - Solution tank; 420 - Aging tank; 430 - Conveying pump. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units (SI) base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0034] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] Example 1

[0038] Among the production methods of nano-calcium carbonate, carbonation is the mainstream process. Carbonation is further divided into three main process routes: intermittent bubbling carbonation, multi-stage spray carbonation, and centrifugal method. All three methods for preparing nano-calcium carbonate have drawbacks. Intermittent bubbling carbonation produces products with uneven particle distribution; while multi-stage spray carbonation and centrifugal method produce more uniform products compared to intermittent bubbling carbonation, they require larger equipment footprints and consume more energy.

[0039] In view of this, the present invention provides a nano-calcium carbonate preparation device, comprising: a carbon dioxide delivery component 100, a spray reaction tank 200, and a separation component 300, wherein both the carbon dioxide delivery component 100 and the separation component 300 are connected to the spray reaction tank 200; the carbon dioxide delivery component 100 includes a first air compressor 110 and a pressure stabilizing tank 120, the outlet pipe of the first air compressor 110 is connected to the pressure stabilizing tank 120, and the outlet pipe of the pressure stabilizing tank 120 is connected to the spray reaction tank 200; the top of the spray reaction tank 200 is provided with a spray head 210 for spraying calcium hydroxide solution, and the spray reaction tank 200 is provided with a pressure reducing valve 220; the separation component 300 includes a filtration mechanism 310 for solid-liquid separation of the nano-calcium carbonate generated by the reaction and the calcium hydroxide solution.

[0040] Please see Figure 1 Carbon dioxide gas is compressed by the first air compressor 110, and the pressure is controlled by the pressure stabilizing tank 120. The pressure reducing valve 220 also controls the pressure during the reaction inside the spray reaction tank 200. The spray head 210 sprays calcium hydroxide solution into the spray reaction tank 200, effectively increasing the contact area between carbon dioxide gas and calcium hydroxide solution. The resulting nano-calcium carbonate and calcium hydroxide solution can be separated into solid and liquid phases by the suction filtration mechanism 310, and then dried to obtain nano-calcium carbonate.

[0041] The nano-calcium carbonate preparation device improves the particle distribution uniformity of the product by controlling the carbon dioxide gas pressure and increasing the contact area between carbon dioxide gas and calcium hydroxide solution. Moreover, it has a small overall footprint, low energy consumption, and low preparation cost.

[0042] The vacuum filtration mechanism 310 is a common mechanism in the mechanical field for achieving solid-liquid separation, and its structure will not be described here.

[0043] In an optional embodiment, the carbon dioxide delivery assembly 100 further includes a pressure swing adsorber 130, the outlet pipe of which is connected to the first air compressor 110, and the pressure swing adsorber 130 is used to concentrate carbon dioxide gas.

[0044] The pressure of the pressure swing adsorber 130 is initially set between 0.2-1 MPa, at which point carbon dioxide is adsorbed into the dehydrated silica gel, activated carbon, and zeolite within the adsorber. The pressure is then reduced to 5-10 kPa, releasing the adsorbed carbon dioxide. This process concentrates carbon dioxide from 10%-20% concentration to approximately 40%, achieving both enrichment and emission of the carbon dioxide gas. The concentrated carbon dioxide gas then enters the first air compressor 110 for further pressurization.

[0045] In an optional embodiment, the carbon dioxide delivery assembly 100 further includes a washing bottle 140, the outlet pipe of which is connected to the pressure swing adsorber 130.

[0046] The water washing bottle 140 can remove small amounts of impurities such as sulfur dioxide and dust from the gas, thereby improving the purity of carbon dioxide gas. The gas after being treated by the water washing bottle 140 then enters the pressure swing adsorber 130.

[0047] In an optional embodiment, the carbon dioxide delivery assembly 100 further includes a second air compressor 150 and a gas collection tank 160. The second air compressor 150 is connected to the gas collection tank 160, and the exhaust gas is collected in the gas collection tank 160 through the second air compressor 150. The outlet pipe of the gas collection tank 160 is connected to the water washing bottle 140.

[0048] Please see Figure 1 The main component of the exhaust gas emitted by the coal-fired power plant is carbon dioxide. The exhaust gas is compressed and collected into the gas collection tank 160 by the second air compressor 150. The gas in the gas collection tank 160 is then injected into the water washing bottle 140 to remove impurities.

[0049] In an optional embodiment, the bottom of the spray reaction tank 200 is connected to an air inlet pipe, and the air outlet pipe of the pressure stabilizing tank 120 is connected to the air inlet pipe. The air inlet pipe is provided with multiple air holes along its axial and radial directions.

[0050] The air inlet pipe installed at the bottom of the spray reaction tank 200 has a diameter of 10-20mm. Four 2mm diameter air holes are arranged along the same transverse cross-section, with each 2cm interval between them. Carbon dioxide gas enters the spray reaction tank 200 through the air inlet pipe.

[0051] In an optional embodiment, the spray head 210 is connected to an inlet pipe 230, and the other end of the inlet pipe 230 is connected to a calcium hydroxide solution delivery assembly 400.

[0052] The calcium hydroxide solution enters the inlet pipe 230 through the calcium hydroxide solution delivery assembly 400, and is then sprayed into the spray reaction tank 200 through the spray head 210.

[0053] In an optional embodiment, the calcium hydroxide solution delivery assembly 400 includes a solution tank 410, an aging tank 420, and a delivery pump 430. The aging tank 420 and the filtration mechanism 310 are both connected to the solution tank 410 via pipelines. The calcium hydroxide solution in the solution tank 410 is delivered to the inlet pipe 230 by the delivery pump 430. A stirring mechanism is provided in the aging tank 420 to stir and dissolve the calcium hydroxide to form a saturated solution.

[0054] Please see Figure 1 First, calcium hydroxide is fully dissolved in aging tank 420 by stirring mechanism to form saturated solution. Then, the saturated solution is pumped into solution tank 410. At the same time, the calcium hydroxide solution separated by suction filtration mechanism 310 is also injected into solution tank 410. Finally, the saturated calcium hydroxide solution in solution tank 410 is injected into liquid inlet pipe 230 by transfer pump 430.

[0055] In an optional embodiment, the bottom of the spray reaction tank 200 is provided with a discharge pipe, and the separation component 300 also includes a storage tank 320. The discharge pipe is connected to the top of the storage tank 320, and the bottom of the storage tank 320 is connected to the suction filtration mechanism 310 through a pipeline.

[0056] Please see Figure 1 The spray reaction tank 200 is equipped with a discharge pipe at the bottom. The suspension generated by the reaction is stored in the storage tank 320 through the discharge pipe. Then, the suspension in the storage tank 320 is placed into the suction filtration mechanism 310, so that the nano calcium carbonate and calcium hydroxide solution generated by the reaction can be separated into solid and liquid.

[0057] It should also be noted that the spray reaction tank 200 is equipped with an exhaust gas discharge structure, which can discharge the gas remaining in the spray reaction tank 200 after the reaction.

[0058] The workflow of the nano-calcium carbonate preparation apparatus in this embodiment is as follows:

[0059] The exhaust gas emitted from the coal-fired power plant is compressed and collected in a gas collection tank 160 by a second air compressor 150. The outlet pipe of the gas collection tank 160 is connected to a water washing bottle 140 to remove small amounts of sulfur dioxide and dust impurities from the gas. The outlet pipe of the water washing bottle 140 is connected to a pressure swing adsorber 130 to enrich and release carbon dioxide gas. The outlet pipe of the pressure swing adsorber 130 is connected to a first air compressor 110. The gas enters the first air compressor 110 and a pressure stabilizing tank 120 for pressurization, and the pressurized gas enters a spray reaction tank 200.

[0060] Calcium hydroxide is first dissolved in aging tank 420 by stirring mechanism to form a saturated solution. Then the saturated solution is pumped into solution tank 410. Finally, the calcium hydroxide saturated solution in solution tank 410 is injected into inlet pipe 230 by transfer pump 430 and then sprayed into spray reaction tank 200 through spray head 210.

[0061] The suspension generated by the reaction of carbon dioxide gas and calcium hydroxide saturated solution in the spray reaction tank 200 is stored in the storage tank 320. Then, the suspension in the storage tank 320 is placed into the suction filtration mechanism 310 to achieve solid-liquid separation of the nano-calcium carbonate and calcium hydroxide solution generated by the reaction. After drying the finished product, nano-calcium carbonate can be obtained.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for preparing nano-calcium carbonate, characterized in that, include: The system includes a carbon dioxide delivery assembly, a spray reaction tank, and a separation assembly, wherein the carbon dioxide delivery assembly and the separation assembly are both connected to the spray reaction tank. The carbon dioxide delivery assembly includes a first air compressor and a pressure stabilizing tank. The outlet pipe of the first air compressor is connected to the pressure stabilizing tank, and the outlet pipe of the pressure stabilizing tank is connected to the spray reaction tank. The top of the spray reaction tank is equipped with a spray head for spraying calcium hydroxide solution, and the spray reaction tank is equipped with a pressure reducing valve; The separation assembly includes a filtration mechanism for solid-liquid separation of the nano-calcium carbonate and calcium hydroxide solution generated in the reaction.

2. The nano-calcium carbonate preparation apparatus according to claim 1, characterized in that, The carbon dioxide delivery assembly also includes a pressure swing adsorber (PSA), the outlet pipe of which is connected to the first air compressor, and the PSA is used to concentrate carbon dioxide gas.

3. The nano-calcium carbonate preparation apparatus according to claim 2, characterized in that, The carbon dioxide delivery assembly also includes a water washing bottle, the outlet pipe of which is connected to the pressure swing adsorber.

4. The nano-calcium carbonate preparation apparatus according to claim 3, characterized in that, The carbon dioxide delivery assembly also includes a second air compressor and a gas collection tank. The second air compressor is connected to the gas collection tank, and the exhaust gas is collected in the gas collection tank through the second air compressor. The outlet pipe of the gas collection tank is connected to the washing bottle.

5. The nano-calcium carbonate preparation apparatus according to claim 1, characterized in that, The bottom of the spray reaction tank is connected to an air inlet pipe, and the air outlet pipe of the pressure stabilizing tank is connected to the air inlet pipe. The air inlet pipe has multiple air holes along its axial and radial directions.

6. The nano-calcium carbonate preparation apparatus according to claim 1, characterized in that, The spray head is connected to a liquid inlet pipe, and the other end of the liquid inlet pipe is connected to a calcium hydroxide solution delivery assembly.

7. The nano-calcium carbonate preparation apparatus according to claim 6, characterized in that, The calcium hydroxide solution delivery assembly includes a solution tank, an aging tank, and a delivery pump. The aging tank and the filtration mechanism are both connected to the solution tank via pipelines. The calcium hydroxide solution in the solution tank is delivered to the inlet pipeline by the delivery pump.

8. The nano-calcium carbonate preparation apparatus according to claim 7, characterized in that, The aging tank is equipped with a stirring mechanism, which is used to stir and dissolve calcium hydroxide to form a saturated solution.

9. The nano-calcium carbonate preparation apparatus according to claim 1, characterized in that, The bottom of the spray reaction tank is provided with a discharge pipe, and the separation assembly also includes a storage tank. The discharge pipe is connected to the top of the storage tank, and the bottom of the storage tank is connected to the filtration mechanism through a pipeline.

10. The nano-calcium carbonate preparation apparatus according to claim 1, characterized in that, The spray reaction tank is equipped with an exhaust gas discharge structure.

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